You have asked for it and we listened. After much research and design we can now offer the following new o ring caliper. O ring calipers are not new to the market just new to LoneStar. Instead of using the lip seal that came from gm these calipers utilize the o ring seals and o ring pistons. Each one is pressure tested and stamped. Calipers are available with brand new Delco moraine castings licensed by GM. If you carry both lip seal and o ring calipers now you can buy them all from LoneStar. Remember to buy from a company that supports you the wholesale dealer and stop buying from those retail manufacturers that want to steal your customer. Keep this in mind when choosing a supplier. Stop supporting your competition!